Ball guide screw develops a tendency deputily

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Send clear ball guide screw early in 19 centuries end deputy, but very long period of time fails to apply actually, because create difficulty too big. Guide screw of the first use ball deputy is company of American general motors Sajinuo distinguishs a works, it ball guide screw deputy be used at the car turn to an orgnaization to go up. 1940, the United States begins to produce the ball guide screw that is used at the car to turn to an orgnaization group by group deputy, 1943, ball guide screw deputy begin to be used on the plane. The occurrence of accurate whorl grinder makes ball guide screw deputy greater leap arose on precision and function, as numerical control machine tool and the development of all sorts of automation equipment, promoted ball to guide screw studies deputily and be produced. Begin from 50 time, in the country that develops in industry, manufacturer of deputy production of ball guide screw appears quickly like emerge, for example: WARNER-BEAVER company of the United States, GM - SAGINAW company; ROTAX company of England; NSK company of Japan, TSUBAKI company. Our country is early the ball guide screw that begins development to be used at programmed control machine tool, numerical control machine tool in 50 time evening deputy. 40 come for years, as a result of ball guide screw deputy have the characteristic such as efficient, high accuracy, tall stiffness, be applied extensively at the domain such as industry of mechanical, spaceflight, aviation, nucleus. Now, ball guide screw deputy the first selection part that already made mechanical drive and fixed position. Deputy development basically is in ball guide screw the following respects. 1 ball guide screw deputy sort because deputy use popularizes ball guide screw ceaselessly, use domain expands ceaselessly, deputy to ball guide screw requirement is increasing also, the ball guide screw of common standards deputy already cannot satisfy use requirement far, if spaceflight aviation domain, small-sized nicety checks plant of instrument of device, electron and semiconductor to wait,basically need 12mm of ≤ of nominal diameter D0, lead Ph=0.

5 ～ 2.

The miniature ball guide screw of 5 Mm deputy. Japanese NSK company already developed nominal diameter D0=4mm, lead Ph=0.

The world of 5mm is the smallest guide screw of lead miniature ball deputy. The guide screw of ball of need miniature big lead such as device of semiconductor plug-in unit, small-sized robot deputy, in order to satisfy requirement of high speed drive. Develop to direction of high speed, efficient, automation as mechanical product, machinery of v of industrial robot, numerical control, machining center and Electromechanical unifinication robot, rate of its feed drive rises ceaselessly, guide screw of big lead ball deputy occurrence, satisfied the requirement that high speed changes. Japanese NSK company already developed lead of nominal diameter × to be: 80mm of × of 60mm of × of 50mm of × of 15mm × 40mm, 16mm, 20mm, 25mm exceeds guide screw of big lead ball deputy, fast feed speed amounts to 180m/min. Ball guide screw deputy be like a graph according to groovy classification 1. On the document outside showing country deputy to ball guide screw the classification that has not united, but each country is to press the following principle to undertake classified commonly, common ball guide screw deputy point to 100mm of ～ of nominal diameter D0=16 commonly, 20mm of lead Ph=4 ～ , helix rises horny φ ＜ 9 ° . Miniature ball guide screw deputy the ball guide screw that points to 12mm of ≤ of nominal diameter D0 deputy. Deputy to the ball guide screw of 3mm of lead Ph ≤ call guide screw of ball of miniature small lead deputy, the ball guide screw that helix rises 9 ° of horny φ ＞ deputy call guide screw of ball of miniature big lead deputy. Guide screw of big lead ball deputy point to 16mm of ≥ of nominal diameter D0, helix promotes role the ball guide screw of 9 ° of ＞ of φ of 17 ° ≥ or D0 of ≤ of Ph of lead D0 ≤ deputy, to helix 17 ° of ＞ of φ promoting role are called exceed guide screw of big lead ball deputy. Heavy-duty ball guide screw deputy the ball guide screw that points to 125mm of ≥ of nominal diameter D0 deputy. Deputy structural tradition cent is guide screw of ball of deputy structure of 2 ball guide screw inside circular structure (it is a delegate with circular reverser and elliptic reverser) with outer circulation structure (it is a delegate with intubate) two kinds. These two kinds of structures also are the most commonly used structure. Function of these two kinds of structures does not have substaintial distinction, just inside size of join of circular structure installation is small; Size of join of installation of outer circulation structure is large. Current, deputy structure already had ball guide screw 10 a variety of, but more commonly used basically have (graph 2, subordinate list) : The structure circulates inside; Outer circulation structure; End builds a structure; Cover board structure. The appearance that structural reverser circulates inside has varied, but, commonly used appearance is the circle is mixed elliptic. Because circular ball is retrorse the passage is briefer, accordingly, oval structure is inferior to on fluent sex. Now, best reverser structure is elliptic inside passageway structure, because ball does not pass guide screw tine to support reversely, structure of similar outer circulation, accordingly, disappear ages besides guide screw the top pours horny error to give ball the effect that brings reversely. But because workmanship is more complex, affected the promotion of this kind of structure. Characteristic of deputy structure of guide screw of subordinate list ball compares phyletic characteristic to encircle several nut dimension to encircle structure of the loop inside series number to form ball loop loop through reverser circularly, each reverser forms ball chain 1 round. Bear the weight of accordingly small. Get used to guide screw of Yu Wei ball deputy as deputy as common ball guide screw. Structure of small outer circulation of above of 1 2 row forms ball loop loop through intubate, each spile at least 1.

5 ball chain, accordingly, bear the weight of big. Suit at small lead, general lead, big lead and heavy-duty ball guide screw deputy. 1.

Structure of lid of an above main aspects passes 5 above the upright lid of two end comprises nut ball loop loop, every loop chain of a ball, bear the weight of big. Suit at bull big lead, exceed guide screw of big lead ball deputy. Structure of 2 above small cover board passes 1 above loop of loop of ball of cover board composition, every nut a cover board, every cover board is comprised at least 1.

5 ball chain. Get used to guide screw of Yu Wei ball deputy. 1.

5 above 1 in deputy precision of 3 ball guide screw goes, to obtain tall fixed position precision, basically come true through raising the precision of body of carbon of ball guide screw, accordingly, accumulate an error to the lead of ball guide screw the demand is very high, to ball guide screw deputy production brings difficulty, make deputy manufacturing cost increases ball guide screw. Especially guide screw of high accuracy ball deputy, accuse whorl grinder or grinder of laser feedback whorl to machine ability to achieve through number only. As the ceaseless development of science and technology, people mastered numerical control to compensate a technology, consequently, do not need very the ball guide screw of high accuracy deputy, also can obtain tall fixed position precision. Amend technical requirement to get used to numerical control, international standard ISO3408-3-1992 and ministry promulgate standard JB3162.

Deputy to ball guide screw journey variation made 2-92 ask, variation of the journey inside radian of variation of the journey inside journey of if effective journey is adept Cheng variation, aleatoric 300mm, 2 π . Its purpose should control the linearity of error of deputy journey of ball guide screw namely, also namely linearization of error of deputy journey of ball guide screw. For numerical control error compensation creates a condition. The ceaseless development of deputy property of 4 ball guide screw as science and technology, people is higher and higher also to ball guide screw asks deputily, to make mechanical product can realize tall fixed position precision and can move smoothly, this is about to beg ball guide screw deputy not only have tall precision, and movement is smooth, without block sluggish phenomenon. Deputy movement of ball guide screw is smooth, basically depend on ball guide screw deputy the variation that tightens torsion beforehand, guide screw of the ball below different rotate speed the fluent sex that deputy ball chain moves is different, accordingly, ball guide screw deputy tighten torsion beforehand not identical also. International standard ISO3408 - 3 - 1992 and the ministry promulgates standard JB3162.

2 - 92 regulations when rotate speed is 100r/min, ball guide screw deputy the allow that tightens torsion beforehand is poor. Because be put in machining error, be like: Dimension of the diameter in ball guide screw is full-length abhorrent, the lead error of guide screw, nut, the surface roughness of the raceway teeth shape error of guide screw and nut and whorl raceway, make deputy trends tightens ball guide screw beforehand torsion going up endlong in guide screw whorl is not constant, this affects the smooth stability of drive system directly, also affect ball guide screw consequently deputy fixed position precision. Accordingly, ball guide screw deputy the main index that the size that tightens torsion variation beforehand is stand or fall of deputy function of reflective ball guide screw. In last few years, the secondary to ball guide screw volume that tightens torsion variation beforehand begins people take seriously rise, people takes ball guide screw seriously only previously curve of error of deputy integrated journey, also begin to take ball guide screw seriously now deputy the curve that tightens torsion beforehand. Because had these two curves, deputy function can mirror ball guide screw well come out. To satisfy afore-mentioned requirements, institute of Beijing machine tool developed ball guide screw early or late error measuring instrument mixes deputy integrated journey to tighten torsion measuring instrument beforehand. The measurement that applies modernization the sensor of method and high accuracy, can show in measuring a process error curve mixes the journey to tighten torsion curve beforehand in real time, print a complete measurement to report, to measure ball guide screw deputy assembly quality, offerred detect reliably method. As the development of numerical control machine tool, "High speed, efficient " the target that becomes each manufacturer pursuit, to high speed drive and fixed position component, abroad already had linear electromotor to come out, begin to be used at machining center, fast feed speed achieves 160m/min above, acceleration amounts to 4g above, to ball guide screw deputy pose grim challenge. But because linear electromotor is put in the price system of costly, control is complex, need to adopt measure to solve magnet to attract a metal to cut bits, strong magnetism to be opposite person harm and calorific wait for defect, get very hard popular in close period of time. Ball guide screw deputy still be now the firstest choice of high speed drive, machining center of foreign major high speed still uses ball guide screw deputy. To achieve goal of high speed drive, electromotor rotate speed is increasing when the design (electromotor is highest while rotate speed can amount to 4000r/min) , use guide screw of big lead ball deputy, lead can amount to 32mm. If Japanese campstool restrains a company,ball guide screw is used on FF660 machine tool deputy, the machine tool moves quickly speed amounts to 90m/min, acceleration is amounted to 1.

5g. Once upon a time, the influence of deputy drive of guide screw of ball of afraid big lead to machining center precision, 10mm of lead Ph ≤ is taken when the design. As the progress of science and technology, from 1999 can see on exhibition of Japan border machine tool, design machining center of as major now as research high speed to use guide screw of big lead ball deputy. Ball guide screw deputy the problem of main when high speed drive existence is: Noise, temperature rise, precision. The account that deputy noise of ball guide screw produces basically has: Of the surface roughness of the ball collision between the fluent sex in circular loop, ball, raceway, guide screw bend etc. Ball guide screw deputy temperature rise basically reachs the attrition generation between ball by the attrition between ball and guide screw, nut, reverser. Should solve afore-mentioned problems to answer above all from ball guide screw deputy structural design begins, take step to the problem of existence; On the other hand, solve from craft, carry reasonable technological process, improve the immanent quality of the product; Choose proper ball guide screw deputy tighten torsion beforehand; Reduce ball guide screw the deputy variation that tightens torsion beforehand, make ball guide screw deputy the requirement that gets used to high speed drive. Anyhow, as ceaseless development of the society, the user is more and more severe to ball guide screw asks deputily, requirement also diversification, make manufacturer of ball guide screw raise new breed of product quality, development ceaselessly, in order to satisfy the requirement of the user. CNC Milling CNC Machining